苝
二亚胺
光催化
光化学
材料科学
可见光谱
化学工程
异质结
光电子学
作者
Shuai Chen,Ling Zang,Benjamin R. Bunes,Yingxuan Li,Virender K. Sharma
标识
DOI:10.1016/j.apcata.2015.03.026
摘要
Graphitic carbon nitride (g-C3N4) is among the most promising metal-free photocatalysts for H2 production from solar-driven water reduction. However, the photocatalytic efficiency of bulk g-C3N4 powders is limited. In this work, molecular aggregates of perylene tetracarboxylic diimides (PTCDIs, a robust class of air-stable n-type organic semiconductor) were loaded via solution processing on the surface of g-C3N4, which is pre-deposited with cocatalyst Pt nanoparticles. The PTCDIs/Pt/g-C3N4 composites thus fabricated exhibit broader visible-light response than Pt/g-C3N4, and possess excellent photochemical stability. The initial intramolecular charge transfer features of the PTCDIs, as well as their energy levels being matched to g-C3N4, ensure subsequent charge separation in the PTCDIs/Pt/g-C3N4 composites. When the composites are dispersed into aqueous solutions containing triethanolamine as a sacrificial electron donor, a tenfold enhancement of H2 evolution activity (∼0.375 μmol h−1) is achieved compared to bare Pt/g-C3N4 under visible-light (λ ≥ 420 nm) irradiation.
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